This was a fun one to work on... Have fun translating all those doujin titles...

References:
Panel 1:
Vanilla is cosplaying Blue from Final Light: https://tapas.io/series/FinalLight
Cosplayer on the left is cosplaying Fusazane from Oni x Fox: https://tapas.io/series/Oni-x-Fox
Cosplayer on the right is cosplaying Rameme a Twitch artist: https://www.twitch.tv/ramememe
Posters on the back is the cover of Ivolice and the Emissaries and another Titiko Boobikawa poster

Panel 2 the one I least want to do:
Poster on the left is an art trade for The Cat, The Vine, and the Victory: https://tapas.io/series/The-Cat-The-Vine-and-The-Victory
The poster on the right is a callback to JODDAS VAPD strip: https://tapas.io/episode/724967
Cosplayer on the right is the OC Tomatita from artist KenronToqueen: https://twitter.com/KenronToqueen
Doujins in the back are fanarts/art trades for the following series from left to right:
Undertale: https://undertale.com/
Melissa and Jullianna: https://tapas.io/series/Mellisa-and-Julianna
Princess is a Total Deviant: https://tapas.io/series/Princess-Deviant
Apricot Cookies: https://tapas.io/series/apricotcookies
Doujins up front artists from left to right:
_O8cho: https://twitter.com/_o8cho
Louistrations: https://twitter.com/Louistrations
Rameme: https://twitter.com/ramememe_uwu
Stephringo (actual nsfw warning): https://twitter.com/stephringo
Louistrations: https://apricotcookies.net/

Panel 3:
The posters from left to right is a reference to Tapas and Webtoons.
Cosplayers from left to right:
Robin from Alliance13:13: https://tapas.io/series/Alliance1313
Fang while holding a Hop-Hop doll from My Friends in Distantland: https://tapas.io/series/My-Friends-in-Distantland
Farah from Amorte: https://tapas.io/series/Amorte
Guy on the far right is wearing a shirt with Mo'o from Keinani and Mo'o: https://tapas.io/series/Keinani-and-MoO

Panel 4:
No real references thank god...